Answer:
1. Circumference of a circle = 2πr or πd (r=radius and d=diameter)
2. Perimeter = 74 feet
3. 2π*5 = 10π
4. π*20 = 20π
Explanation:
1. Diameter is equal to radius*2.
2. 25+25+12+12=74
3. Substitute 5 for r in the formula.
4. Substitute 20 for d in the second formula.